Teleport / Teleport Ally is a natural SM advantage over other classes and it always was. You have already changed genuine Teleport settings by implementing cool down and now you are trying even harder. Maybe remove Teleport from the game permanently, so that it doesn’t cause any more confusion?
Following this line of reasoning, you should also block DL’s horse and all other pets during invasions, so that everyone moves around the map with the same speed. I’m not even mentioning, that Teleport is useful only in Dung1 to move from warp to middle map zone (leaving start of the map for other classes to hunt anyway) and start of Dung2 to move between walls. All other parts of Dungeon are the same for all classes. Completely useless and stupid idea without reasonable arguments.